import axios from 'axios'
import { Notification, MessageBox, Message } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'
import errorCode from '@/utils/errorCode'
import qs from 'qs'

axios.defaults.headers['Content-Type'] = 'application/json;charset=utf-8'
// 创建axios实例
const service = axios.create({
  // axios中请求配置有baseURL选项，表示请求URL公共部分
  baseURL: process.env.VUE_APP_BASE_API,
  // 超时
  timeout: 10000
})
// request拦截器
service.interceptors.request.use(config => {
  // 是否需要设置 token
  const isToken = (config.headers || {}).isToken === false
  if (getToken() && !isToken) {
    config.headers['token'] = getToken() // 让每个请求携带自定义token 请根据实际情况自行修改
  }
  // get请求映射params参数
  if (config.method === 'get' && config.params) {
    let url = config.url + '?';
    for (const propName of Object.keys(config.params)) {
      const value = config.params[propName];
      var part = encodeURIComponent(propName) + "=";
      if (value !== null && typeof(value) !== "undefined") {
        if (typeof value === 'object') {
          for (const key of Object.keys(value)) {
            let params = propName + '[' + key + ']';
            var subPart = encodeURIComponent(params) + "=";
            url += subPart + encodeURIComponent(value[key]) + "&";
          }
        } else {
          url += part + encodeURIComponent(value) + "&";
        }
      }
    }
    url = url.slice(0, -1);
    config.params = {};
    config.url = url;
  }
  return config
}, error => {
  console.log(error)
  Promise.reject(error)
})

// 响应拦截器
service.interceptors.response.use(res => {
    // 未设置状态码则默认成功状态
    const code = res.data.code || 200||100;
    // 获取错误信息
    const msg = errorCode[code] || res.data.msg || errorCode['default']
    if (code === 401) {
      MessageBox.confirm('登录状态已过期，您可以继续留在该页面，或者重新登录', '系统提示', {
          confirmButtonText: '重新登录',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).then(() => {
        store.dispatch('LogOut').then(() => {
          location.href = '/index';
        })
      })
    } else if (code === 500) {
      Message({
        message: msg,
        type: 'error'
      })
      return Promise.reject(new Error(msg))
    } else if (code !== 200 && code !== 100) {
      Notification.error({
        title: msg
      })
      return Promise.reject('error')
    } else {
      return res.data
    }
  },
  error => {
    console.log('err' + error)
    let { message } = error;
    if (message == "Network Error") {
      message = "后端接口连接异常";
    }
    else if (message.includes("timeout")) {
      message = "系统接口请求超时";
    }
    else if (message.includes("Request failed with status code")) {
      message = "系统接口" + message.substr(message.length - 3) + "异常";
    }
    Message({
      message: message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)

/**
 * post方法，对应post请求
 * @param {String} url [请求的url地址]
 * @param {Object} params [请求时携带的参数]
 */
function post(url, params) {
  return new Promise((resolve, reject) => {
    service({
      method: 'post',
      url: url,
      data: qs.stringify(params),
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded'
      }
    }).then(res => {
      resolve(res.data)
    })
      .catch(err => {
        reject(err.data)
      })
  })
}


/**
 * get方法，对应get请求
 * @param {String} url [请求的url地址]
 * @param {Object} params [请求时携带的参数]
 */
function get(url, params) {
  return new Promise((resolve, reject) => {
    // axios.get(url, {
    //     params: params
    // })
    //     .then(res => {
    //         resolve(res.data)
    //     })
    //     .catch(err => {
    //         reject(err.data)
    //     })
    service({
      method: 'get',
      url: url,
      params: params,
      data: params
    }).then(res => {
      resolve(res)
    })
      .catch(err => {
        reject(err)
      })
  })
}

/**
 * json请求方法，对应post请求
 * @param {String} url [请求的url地址]
 * @param {Object} params [请求时携带的参数]
 */
function json(url, params) {
  return new Promise((resolve, reject) => {
    service({
      method: 'post',
      url: url,
      headers: {'content-Type': 'application/json; charset=utf-8'},
      data: JSON.stringify(params) // 转成json字符串
    }).then(res => {
      resolve(res.data)
    })
      .catch(err => {
        reject(err.data)
      })
  })
}

function exportExcel(url, params) {
  return service({ // 用axios发送post请求
    method: 'post',
    url: url, // 请求地址
    data: JSON.stringify(params), // 转成json字符串
    responseType: 'blob', // 表明返回服务器返回的数据类型
    headers: {'content-Type': 'application/json; charset=utf-8'},
  })
}

export const http = {
  get: (url, params) => get(url, params),
  post: (url, params) => post(url, params),
  json: (url, params) => json(url, params),
  exportExcel: (url, params) => exportExcel(url, params)
}


export default service

